n. a large stone worn smooth by erosion. boulder-clay Geol. a mixture of boulders etc. formed by deposition from massive bodies of melting ice, to give distinctive glacial formations.
[ short for boulderstone, ME f. Scand. ]
BOULDER
Meaning of BOULDER in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012